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State machines also have a wide range of uses in game development, especially the logic writing of game AI. The main characters in the game have various states such as walking, attacking, defending, falling and jumping. These states are both interrelated and constrained. For example, if attacked during walking, it will switch from walking state to falling state. In the state of falling, it can neither attack nor defend. Similarly, you cannot switch to the defensive state during the jump, but you can attack. This kind of scenario is very suitable to be described by state machine. The code is as follows:杰克·穆尼（Jack Mooney）开始在阳光普照的圣玛丽岛定居，他还有一些无法解决的谜团。 一位冠军扑克玩家，显然在一个震惊的观众面前在桌子上中毒。 一位小说家，在一个阴谋中被谋杀，比他写过的任何东西都更令人惊讶。 一位精神领袖，在所有嫌疑犯都是彼此的不在场时被勒死。 杰克的简洁风格掩盖了他敏锐的胸怀和坚定的决心。 他是一位出色的侦探，他将需要他所有的本能天才来解决这些令人困惑的谋杀案。黎章听了眼睛一亮，当即道：好。Advanced Mathematics (Tongji 7th Edition): Yes, what I said is the reference book for postgraduate entrance examination. It is really good, with moderate difficulty, and with the corresponding video or video of some basic courses abroad, the high number understands the limit, derivative, differential and integral are almost the same.　　目前还不知道这部影片的更多细节，只知道该片仍然由伍迪·艾伦自编自导，将在今年秋季开拍。曾与伍迪合作电视剧的亚马逊影业有望负责该片的发行。2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.